On 1/10/08, Derrick Ryalls <[EMAIL PROTECTED]> wrote:
> Perhaps I need to re-evaluate my line of thinking. Light sometime
> flicker, but power almost never goes out. When it does it is either
> back on in less than 1 minute, or out for hours. If the UPS detects
> critical correctly and gives me at least a minute before death, then
> that should be plenty of time for the system to auto-shutdown. Guess
> I will have to do some experimentation tonight.
While you experiment, keep in mind the following sequence of events:
-- Power fails
-- UPS signals low battery
-- System shuts down
-- Power returns before UPS shuts itself down
--> System never reboots, because it never lost power.
Getting around this is the tricky part. I haven't used NUT in about
seven years, but back then the recommendation was to shut down to
single user mode and run a script that delayed for some time longer
than the remaining battery life of the UPS, then rebooted the system.
There didn't seem to be an easy hook for running a script after
shutting down to single user mode (maybe there is now).
I haven't looked at NUT recently, but I expect the various flags that
you are supposed to test are another way around this problem.
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